百ます計算ドラゴン育成　ドラゴンガーデン is a completely free iPhone game developed by Wakako Noro. This game allows players to raise adorable dragons by using the coins they earn from solving math problems. The type of dragon that evolves depends on the type of food given to them. There are a total of 24 different types of dragons to collect, and players can track their progress through the dragon breeding table in the help screen.

In addition to the dragon breeding aspect, 百ます計算ドラゴン育成　ドラゴンガーデン also offers math practice through the "百マス計算" mode. Players can choose from three types of calculations (addition, subtraction, multiplication) and select the number of questions to solve (10, 30, 50, orThe game also includes 2-digit by 2-digit multiplication problems with hints available in the form of abacus mental calculation or Indian-style calculation.

With the inclusion of 2-digit addition and subtraction problems, players can easily improve their calculation skills. The game keeps track of the past 50 time records, displaying them in a clear graph. Self-best time and average time are also shown. It is recommended to record progress daily to ensure continuous improvement.

After completing the game, players can reset the dragons while keeping their coins and time records by using the "リセット" button in the settings menu.

The game features background music provided by guitarist Daisuke Minamisawa, with all tracks using acoustic guitar live performance recordings in the fingerpicking style.